(x+20)+(x+20)+(x-40)=180

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Solution for (x+20)+(x+20)+(x-40)=180 equation: 



(x+20)+(x+20)+(x-40)=180

We move all terms to the left:

(x+20)+(x+20)+(x-40)-(180)=0

We get rid of parentheses

x+x+x+20+20-40-180=0

We add all the numbers together, and all the variables

3x-180=0

We move all terms containing x to the left, all other terms to the right

3x=180

x=180/3

x=60

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